Microwave oven



FIG. 1 is a front elevational view of a microwave oven showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front perspective thereof, and

FIG. 8 is a front perspective view of a second embodiment thereof. 

The ornamental design for a microwave oven, as shown and described. 